You searched for: Subject Health Remove constraint Subject: Health Place Washington (D.C.) Remove constraint Place: Washington (D.C.) Place United States Virgin Islands Remove constraint Place: United States Virgin Islands Year 1979 Remove constraint Year: 1979
1979. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the ozone (O3) ... United States. Bureau of Transportation Statistics.